Physics 9702 · AS & A Level · Characteristics of alternating currents
Characteristics of alternating currents — practice question
A coaxial cable is often used to link an aerial to a television receiver, as shown in Fig. 4.1.
(a)[2]
Suggest two roles played by the copper braid.
(b)[2]
Suggest two reasons a wire pair is not usually used to connect the aerial to the receiver.
(c)[4]
A coaxial cable linking an aerial to a receiver is $14\,\text{m}$ long. Its attenuation per unit length is $190\,\text{dB km}^{-1}$. Calculate the fractional loss in signal power as the signal travels along the cable.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Serves as the signal return conductor” …